Diego Fiorentini was born on 1 November 1911 and was from Argenta (Ferrara).

In November 1941, Fiorentini belonged to 75^a Squadriglia of 23^o Autonomo CT, based at Pantelleria off Sicily. This unit was at this time equipped with Fiat CR.42s.

On 11 December Flight Lieutenant 'Ginger' Neil of 249 Squadron was sent off from Malta to escort a Wellington, which was reported to be under attack whilst on its way to Malta from Gibraltar, carrying aboard his replacement, Flight Lieutenant Sidney Brandt. The bomber had been intercepted by three 23^o Gruppo CR.42s scrambled from Pantelleria, the pilots of which reported attacking four Wellingtons. One of these was claimed shot down into the sea by Sergente Luigi Sacchi, while Maresciallo Fiorentini and Sergente Giuseppe Saracino attacked two others. Fiorentini was shot down by one of the rear gunners and he baled out of his stricken fighter but his parachute did not open.
It seems that two of the Wellingtons were lost, R1246 and R1250, both in transit from Gibraltar to the Middle East.

At the time of his death Fiorentini was credited with 1 shared biplane victory, this one being claimed while flying Fiat CR.42s.

Claims:

Kill no.	Date	Number	Type	Result	Plane type	Serial no.	Locality	Unit
	1941
	11/12/41		Wellington (a)	Shared destroyed	Fiat CR.42		off Pantelleria	75a Squadriglia

Biplane victories: 1 shared destroyed.
TOTAL: 1 shared destroyed.
(a) Wellingtons R1246 and R1250 lost during transit from Gibraltar to the Middle East.

Sources:
Elenco Nominativo dei Militari dell’ A. M. Decorati al V. M. Durante it Periodo 1929 - 1945 1 Volume A - L
Malta: The Hurricane Years 1940-41 - Christopher Shores and Brian Cull with Nicola Malizia, 1987 Grub Street, London, ISBN 0-89747-207-1